Serie LW30
Rotary Isolator Switch
A finger-safe rotary isolator switch for AC 50 Hz main circuits up to 440 V. Built as the main switch of air-conditioners, water pumps, ventilating equipment and small AC motors — with add-on auxiliary contacts, a neutral terminal, an earthing terminal and an optional IP65 enclosure.
What The LW30 Rotary Isolator Switch Covers
En LW30 rotary isolator switch breaks, closes and changes over circuits under infrequent manual operation. It is the standard main switch in air-conditioner units, water pump panels and ventilating equipment, and it also drives small AC motors directly.
The body is offered in nine current ratings from 20 A to 175 A. Auxiliary contacts, a neutral terminal and an earthing terminal are separate options on the same body, so one product family can build a complete distribution panel without adding terminal blocks.
Because the insulation distance is larger than a conventional switch and the disconnecting motion is fast, the LW30 is also used on DC circuits. A thermoplastic sealing box takes the protection level from IP2L0 to IP65 across the whole current range.
Each pole is a double-break contact, so the arc is split twice and a stalled motor is cleared without welding the contacts. The rated current is moulded into the front plate, and the same body is built as a 3-pole or a 4-pole unit without changing the panel cut-out.
For export projects every batch ships with a dimensional drawing and a routine test record. The ordering code, the mounting version and the plate legend are confirmed in writing before production starts, so the batch that arrives matches the panel you designed.
Mounting Options For A Rotary Isolator Switch
One switch body, six ways to fit it. Plate and single-hole versions take a 1–5 mm panel; front plates are M0 to M4 square plates with 4-D2 fixing holes, and base versions mount on a 35 mm parallel. Pick the version that matches your panel, then confirm the code with our engineer.
Escutcheon Plate
Panel mount · 20 A to 175 A
Single Hole
φ22.3 mm hole · 20 A to 32 A
DIN Rail
35 mm rail · with pad-lock option
Plate + Pad-lock
Lockable in OFF · 20 A to 175 A
Door-lock Base
Door interlock · 20 A to 175 A
IP65 Sealing Box
Protective box · 20 A to 175 ANeed a mounting that is not listed, or a plate printed with your own legend? Send us the panel drawing
Not sure which mounting version fits? Send the panel drawing — we reply with the model and the full ordering code.
Choosing The Right Rotary Isolator Switch
Pick the rated current first, then check the category. AC-23A is the mixed inductive load rating, AC-3 the squirrel-cage motor rating — both are printed on the table below so you can size the switch against the motor plate.
| Model | Corriente térmica nominal | Rated voltage | AC-23A | AC-3 | Postes |
|---|---|---|---|---|---|
| LW30-20 | 20 A | 240 / 440 V | 11 A / 5,5 kW | 7,5 A / 3,7 kW | 3P, 4P |
| LW30-25 | 25 A | 240 / 440 V | 15 A / 7,5 kW | 11 A / 5,5 kW | 3P, 4P |
| LW30-32 | 32 A | 240 / 440 V | 22 A / 11 kW | 15 A / 7,5 kW | 3P, 4P |
| LW30-40 | 40 A | 240 / 440 V | 30 A / 15 kW | 22 A / 11 kW | 3P, 4P |
| LW30-63 | 63 A | 240 / 440 V | 43 A / 22 kW | 36 A / 18.5 kW | 3P, 4P |
| LW30-80 | 80 A | 240 / 440 V | 57 A / 30 kW | 43 A / 22 kW | 3P, 4P |
| LW30-100 | 100 A | 240 / 440 V | 70 A / 37 kW | 57 A / 30 kW | 3P, 4P |
| LW30-125 | 125 A | 240 / 440 V | 90 A / 45 kW | 70 A / 37 kW | 3P, 4P |
| LW30-175 | 175 A | 240 / 440 V | 110 A / 55 kW | 90 A / 45 kW | 3P, 4P |
How To Build The Rotary Isolator Switch Ordering Code
Built field by field. Give us the fields you need and our engineer returns the confirmed string against your panel drawing.
| Field | Opciones | Meaning |
|---|---|---|
| Product code | LW30 | Rotary isolator switch family |
| Corriente térmica nominal | 20 / 25 / 32 / 40 / 63 / 80 / 100 / 125 / 175 | Nominal current in ampere |
| Número de polos | 3P, 4P | Pole count of the main contact |
| Additional contacts | 0 = not inclosed, 1 = with | Auxiliary contact block on the side |
| Neutral terminal | 0 = not inclosed, 1 = with | Neutral terminal fitted |
| Earthing terminal | 0 = not inclosed, 1 = with | Earthing terminal fitted |
| Way of installation | 1 escutcheon plate with pad-lock · 2 escutcheon plate · 3 single pad-lock DIN-rail · 4 door-lock base with pad-lock · 5 single hole | How the switch is mounted |
| Type of box | 0 = plastic box not inclosed, 1 = with plastic box | IP65 sealing box |
| Type of escutcheon plate | 1 plate · 2 φ22.5 hole · 3 φ25 hole · 4 φ30.5 hole | Front plate size |
| Plate with airproof | 0 = not inclosed, 1 = inclosed | Gasket behind the plate |
| Colour of bottom plate | 1 silver · 2 yellow · 3 made to your colour | Colour of the switch base |
| Character letter | Letter, Chinese letter or special sign | Marking printed on the plate |
| Code of handle | R, K, I | R type knob, K type lever, I type knob |
40 A, 3P, with additional contacts and earthing terminal, escutcheon plate, no neutral terminal, no plastic box
32 A, 3P, door-lock base installation with pad-lock system, no accessories
40 A, 3P, escutcheon plate with airproof, yellow bottom plate, Chinese letter marking, K type handle
Where A Rotary Isolator Switch Is Used
The catalogue names air-conditioners, water pumps and ventilating equipment as the primary applications. In all three the rotary isolator switch sits on the panel as the visible point of isolation, with small AC motors switched directly.
Water pump control panel
The isolator sits on the panel door as the visible point of isolation. Finger-protection terminals cover the live parts behind it, and the pad-lock or door-lock version keeps the panel locked off during maintenance.
Air-conditioner and ventilation units
The LW30 is the main switch inside the unit. A neutral terminal and an earthing terminal can be ordered on the same body, so the supply is terminated at the switch instead of a separate terminal block.
Switchgear and distribution assemblies
Base installation and DIN-rail mounting let several LW30 units sit side by side in a 35 mm assembly, with the auxiliary contacts wired to the panel indication circuit.
How Our Rotary Isolator Switch Is Manufactured
Nine stages from raw material to loading, all inside our own workshop in Liushi, Wenzhou: contact parts, assembly, testing and packing are not subcontracted, so the batch you receive comes off the line you see here.
LW30 Rotary Isolator Switch FAQ
Tap a question to open the answer.
Is the LW30 a rotary isolator switch or a cam switch?
Both names describe the same product. Cantak names it a rotary isolator switch, and the catalogue also uses the term cam switch because the contacts are operated by cam plates. In the ordering code the family is written as "Rotary switch (Cam switch)".
Which LW30 model gives IP65 protection?
Any LW30 from 20 A to 175 A can be ordered with the thermoplastic sealing box. Without the box the protection level is IP2L0; with the box it is IP65.
What is the difference between LW30 and LW30B?
LW30B is the B derivative of the same family, used as the main switch of ventilation equipment, air-conditioners and water pump systems. It covers 16 A to 32 A with Ui 690 V. The LW30 itself covers 20 A to 175 A at 240 / 440 V.
Can the auxiliary contacts be fitted later?
The additional contact blocks mount separately on the switch body, so they can be added on the same body rather than replaced. Rating is AC15 220–240 V 6 A and 380–440 V 4 A, with 20,000 electrical operations.
What does finger-protection terminal mean?
It is a shroud around the connection screws that keeps a finger away from the live busbar. The LW30 series has it fitted as standard, which matters when the panel is inspected with the door open.
How do I confirm the ordering code before production?
Send the rated current, pole count, mounting type, the accessories you need and the panel legend. Our engineer returns the complete ordering code plus a dimension drawing for your approval before the order is released.
Is there a DC or photovoltaic version?
Yes. The same catalogue carries a Photovoltaic (PV) DC version of the LW30, listed with operating current, operating voltage, bypass PV load voltage, isolation voltage and cable diameter. Ask us for that page if your project is a PV application.
Can I get a sample before placing a bulk order?
Tell us the model and the quantity you need for evaluation and we will quote it together with the production order. The switch is a catalogue item, so the sample and the production unit come off the same line.
Need the LW30 price or a drawing for your panel? Write to sales@cantak.cn
Request A Rotary Isolator Switch Quote
Tell us the current rating, pole count, mounting type and the legend you need. We reply within 24 hours with the price, the lead time and the confirmed ordering code.